"The [Bill & Melinda Gates] Foundation will celebrate its 25th anniversary next year. We haven't gotten rid of polio, we haven't got rid of malaria. I'm very, very committed to those things," says Gates. "We want to cut childhood deaths in half again, from 5 million to 2.5 million."
That's a big reason why Gates wants to wait as long as possible significantly lightening his workload, he says.